金融工程日报：a股高开低走，AI应用题材全线回落、存储器概念股爆发-20260117

• The report does not contain any quantitative models or factors, so there are no specific models or factors to summarize - The report primarily focuses on market performance, market sentiment, capital flows, premium and discount rates, institutional attention, and leaderboard data - Market performance: The CSI 500 index performed well among scale indices, while the STAR 100 index performed well among sector indices, and the CSI 500 Growth index performed well among style indices[2][6][7] - Market sentiment: On January 16, 2026, 66 stocks hit the daily limit up, and 61 stocks hit the daily limit down. The closing return of stocks that hit the daily limit yesterday was -0.35%, and the closing return of stocks that hit the daily limit down yesterday was -6.30%. The sealing rate was 56%, and the continuous board rate was 12%[2][13][14][17] - Capital flows: As of January 15, 2026, the balance of margin trading and securities lending was 2.7188 trillion yuan, accounting for 2.6% of the market's circulating market value, and the proportion of margin trading and securities lending transactions in the market's transaction volume was 10.8%[2][19][22] - Premium and discount rates: On January 15, 2026, the ETF with the highest premium was the Semiconductor Equipment ETF Huaxia, with a premium of 1.88%, and the ETF with the highest discount was the Satellite Industry ETF, with a discount of 2.31%. The median annualized discount rates of the main contracts of the SSE 50, CSI 300, CSI 500, and CSI 1000 stock index futures over the past year were 0.70%, 3.79%, 11.11%, and 13.61%, respectively[3][23][26][28] - Institutional attention and leaderboard: The stocks with the most institutional research in the past week were Haitian Ruisheng, Dikang Holdings, Leo Group, Kaisheng Technology, Boying Special Welding, SF Express, Yunnan Germanium Industry, and Shengda Resources. The top ten stocks with net inflows from institutional seats on the leaderboard were Xue Ren Group, Tongyu Communications, Hongxiang Holdings, Yongxi Electronics, Shaanxi Tourism, Taili Technology, Jintaiyang, Hualing Cable, Shenguang Group, and Hengkun New Materials[4][30][32][36][37][39][41]